{
  "abstract": "We introduce a new, independent modeling component to the Carousel Lens series by exploiting the spatially-resolved kinematics contained within the lensed arcs, which so far has remained rather underexplored in strong-lensing analyses. We present an end-to-end forward-modeling framework that reconstructs an integral-field spectroscopic datacube from a parameterization of the lens convergence profile together with the line-of-sight velocity, velocity dispersion, and surface brightness profiles of the unlensed source. The kinematic structure of the source acts as an additional set of ray-traceable markers distributed across every lensed image, inaccessible from imaging data alone. Furthermore, by generating an [OII] emission-line datacube, we isolate a single source redshift and remove lens and line-of-sight light contamination. We apply this framework to deep VLT/MUSE observations of the Carousel Lens, modeling the [OII] emission of the quadruply-imaged star-forming galaxy at $z_{\\rm s} = 1.432$ that anchors the system's cosmography constraints. We measure an Einstein radius $θ_{\\rm E} = 12.816''^{+0.005}_{-0.007}$ and a logarithmic slope $γ= 1.412^{+0.002}_{-0.002}$, tightening the statistical uncertainties on both by roughly a factor of $2-2.5$ relative to the corresponding flat emission-line map model. We find that the source galaxy exhibits a strong rotation, lies confidently along the star-forming main sequence, and has an inferred central black hole mass of $\\log M_{\\rm BH}/M_{\\odot} = 7.89 \\pm 0.51$. These results establish datacube-level forward modeling as a practical and independent route to traditional image-based lens models in the current systematics-limited regime, and one that extends naturally to this system's other lensed sources and to other lens systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.37971",
  "author_total": 12,
  "authors": [
    {
      "name": "William Sheu"
    },
    {
      "name": "Xiaosheng Huang"
    },
    {
      "name": "Tania M. Barone"
    },
    {
      "name": "Fuyan Bian"
    },
    {
      "name": "Aleksandar Cikota"
    },
    {
      "name": "Karl Glazebrook"
    },
    {
      "name": "Tesla Jeltema"
    },
    {
      "name": "Evan Odell"
    },
    {
      "name": "Jackson H. O'Donnell"
    },
    {
      "name": "Linus Upson"
    },
    {
      "name": "Felipe Urcelay"
    },
    {
      "name": "Sean Xu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e9fv650p337ry.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.37971",
  "fulltext_url": null,
  "id": "e9fv650p337ry",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.37971",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.37971",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e9fv650p337ry.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.37971",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.37971"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "The Carousel Lens III: Joint lens convergence and source kinematic modeling",
  "title_text": "The Carousel Lens III: Joint lens convergence and source kinematic modeling",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/e9fv650p337ry",
  "venue": "arXiv",
  "versions": []
}